GetThisDone wrote:

25. If you have no keyboarding skills at all, you will not be able to use a computer. And if you

are not able to use a computer, you will not be able to write your essays using a word

processing program. If the statements above are true, which one of the following must be

true?

a) If you have some keyboarding skills, you will be able to write your essays using a word

processing program.

b) If you are not able to write your essays using a word processing program, you have no

keyboarding skills.

c) If you are able to write your essays using a word processing program, you have at least some

keyboarding skills.

d) If you are able to use a computer, you will probably be able to write your essays using a

word processing program.

e) If you are not able to write your essays using a word processing program, you are not able to

use a computer.

Main CR Qs link -

cr-qs-600-700-level-131508.htmlHere are some basics of logic that will help you answer such questions very quickly.

Focus on the condition structure: If A, then B

Here, A implies B

and B-negated implies A-negated

Mind you, B does not imply A

A-negated does not imply B-negated.

Let's take an example:

If it rains, the playground gets wet.

A - It rains

B - The playground got wet

A-negated - It didn't rain.

B-negated - the playground didn't get wet.

If A, then B

A implies B

'It rained' implies 'the playground got wet'

B-negated implies A-negated

'The playground did not get wet' implies 'it did not rain'

B does not imply A

'The playground got wet' does not imply 'it rained' (Perhaps, someone made it wet with a hose)

A-negated does not imply B-negated

'It didn't rain' does not imply 'The playground did not get wet' (Again, someone could have made it wet with a hose. We don't know whether it got wet or not)

Remember this:

If A, then B

Here, A implies B

and B-negated implies A-negatedIf you have no keyboarding skills at all, you will not be able to use a computer. And if you

are not able to use a computer, you will not be able to write your essays using a word

processing program.

If A, then B. If B, then C

So we can say 'If A, then C'

A implies C

and C-negated implies A-negated

If 'you have no keyboarding skills', then 'you will not be able to write your essays using a word

processing program'

A - you have no keyboarding skills

C - you will not be able to write your essays using a word

processing program

A - negated - you have some keyboarding skills

C - negated - you will be able to write your essays using a word

processing program

Notice option C now.

c) If you are able to write your essays using a word processing program, you have at least some

keyboarding skills.

It is 'C - negated' implies 'A - negated' which we know to be true.

Hence, C is correct.

Look at D

d) If you are able to use a computer, you will probably be able to write your essays using a

word processing program.

It is of the form: If B, then C

The option D says, 'B - negated' implies 'C-negated' which we know doesn't hold.

Hence, D is not correct.

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Karishma

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